#include <iostream>
#include <memory>
#include <vector>
#include <string>

using std::cout;
using std::endl;
using std::shared_ptr;
using std::vector;
using std::string;

void test()
{
    shared_ptr<vector<string>> file;
    string text("hello");
    file->push_back(text);

    //shared_ptr --->bool
    if(file)
    {

    }

    if(!file)
    {

    }
}

int main(int argc, char *argv[])
{
    test();
    return 0;
}

